Hi Jerry: If you have my notes on setting the Baldassin/Sanderson/Kimbell/Tremper Temperament, your will notice that I deliberately set the first F3-A3 at 8 or 9 bps instead of 7bps. Then I tune the F4 octave just the same as the A3-A4 octave. The purpose for this (a Rick Baldassin idea) is that all three M3rds (F-A, A-C#, and C#-F) will be about the same and it will be easier to fit the C#4 exactly so that the middle M3rd is the same or equally between the other two 3rds in speed. After this, I next tune the F4 so that the middle 3rd C#-F4 is equally balanced between the two A's. As a result the 3 contiguous 3rds from A to A will each be in a 5:4 ratio (relationship?). After this I tune the F3-A3 to balance with the other 3 M3rds and also check the F3-F4 octave. The result of this may not make the F3 M3rd equal 7 bps, but it will be the speed which this particular piano requires. Pianos which have a hockey-stick shaped Tenor bridge will usually have a slower F3-A3 M3rd. Only large pianos with low inharmonicity will actually have a 7 bps speed on F3-A3. Jim Coleman, Sr. On Thu, 16 Dec 1999, Jerry Hunt wrote: > I understand and appreciate the extent to which > setting the contiguous thirds F-A, A-C#, C#-F & F-A in > a 4:5 ration sets the foundation of a good temperament > (of the ET variety). Most of the bearing plans I've > seen start with something like "set F3 to A3 to beat > about 7bps, set C#4 to A3 to beat about 9bps, tune F4, > test that the contiguous 3rds have a 4:5 ratio..." > > My question is this, having tuned the F's and the C# > and noting that the ratios aren't working out quite > right, how do I determine if the problem is the F's or > the C#? > > Many thanks for your help. > > Jerry Hunt > Associate Member PTG (shooting for RPT in 2000) > Dallas, TX > __________________________________________________ > Do You Yahoo!? > Thousands of Stores. Millions of Products. All in one place. > Yahoo! Shopping: http://shopping.yahoo.com >
This PTG archive page provided courtesy of Moy Piano Service, LLC